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04-08-2012, 06:37 AM   #1
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Crazy suggestion for Pentax? Add one lens without manufacturing it...

I am talking about the 160-degree fish-eye. How about introducing a firmware upgrade enabling the user to choose whether to shoot it as originally intended OR in the slightly cropped de-fished mode, making it essentially a proper wide-angle prime without the fish gimmick. I am sure the camera processor can perform de-fishing on-th-fly - after all, there is a fish-eye filter mode, so the opposite should work as well

04-08-2012, 06:41 AM   #2
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That would be cool. However, defishing in PP is easy and fast too.
04-08-2012, 07:58 AM   #3
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interesting idea- do you mean the 10-17? would be a useful thing to have though definitely!

the image quality wouldn't be as good as a rectilinear prime at the same focal length as the defished crop though- probably quite bait worse cos you would lose resolution too
04-08-2012, 08:45 AM   #4
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Do your defishing in post processing and get on with life. The more code they put into these things the more chance there is of something breaking.

04-08-2012, 10:19 AM   #5
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I know how to defish, I just can't be bothered TBH. Would be much more convenient if the camera did it for me - if I could already frame and take the de-fished shot.
04-08-2012, 11:50 AM - 1 Like   #6
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You don't need to do it in PP with the Q. The Q can do Ultra wide Angle shots already for cheap. Go Buy a 40.5mm to 58mm step-up ring, a quality 0.5x or 0.43x wide angle tele convertor, and the 02 zoom and you have a camera that will do 13-14mm wide angle shots ( in 35 mm equivalent ). I use the Q now instead of my K-x for ultra wide-angle shots because of this. My other option was to buy the Sigma 8-16mm lens fro $700.

http://www.flickr.com/photos/kdkns/sets/72157629356111754/
04-08-2012, 12:03 PM   #7
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Here are some photos that were cropped to 16x9 format but other then that no editing. Using the bold monochrome filter.

Attachment 123542

Attachment 123543

Last edited by knightzerox; 09-10-2014 at 08:47 PM.
04-08-2012, 11:53 PM   #8
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QuoteOriginally posted by knightzerox Quote
You don't need to do it in PP with the Q. The Q can do Ultra wide Angle shots already for cheap. Go Buy a 40.5mm to 58mm step-up ring, a quality 0.5x or 0.43x wide angle tele convertor, and the 02 zoom and you have a camera that will do 13-14mm wide angle shots ( in 35 mm equivalent ). I use the Q now instead of my K-x for ultra wide-angle shots because of this. My other option was to buy the Sigma 8-16mm lens fro $700.

2012 Pentax Q Wide Angle & Telephoto - a set on Flickr
Will you cover the cost of the zoom lens for me?
I am talking about a compact prime solution, much less hassle.

04-12-2012, 11:57 PM   #9
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Neat knightzerox. Seems to work well. The Q zoom is approx 29mm eq. on the wide end. So why don't you use the 18-55 lens, 52-58 step up ring, and the wide adapter on your DSLR to do the same thing as the Q combo? Is there some quality advantage to doing it with the Q? It is cool either way.
thanks
barondla
04-18-2012, 11:33 AM   #10
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Hi Barondla,
You are correct that you can add the wide angle to the 18-55m but you would not get the same viewing angle. Remember, the crop factor for Pentax DSLR's is about 1.5x the listed focal length. Taking the 18-55, at 18 it's equivalent to at 27mm focal length on a 35mm camera. Put a 0.5x wide angle lens on it and it gives a possible viewing angle of 13.5mm which is great. The reality is though that extreme vignetting occurs at that range. On my K-x with the 18-55 lens, it must be set to about 24mm for no vignetting. 24 * 1.5 = 36mm equivalent. Now cut that in half and you get an 18mm wide angle lens. Still very good and helps a lot.

However, with the Q, the widest angle is 27.5mm ( 35 mm equivalent again ). Cut that in half and you get a 13.75mm possible viewing angle. But with the Q, using a 58mm wide angle lens, and for whatever other reasons, you get very little vignetting. Meaning, you can set the Q very very close to it's widest setting. Just under the 6mm mark. As an added bonus the wide-angle works well on the 01 prime lens also. There also isn't that much or noticeable distortion or fish eye distortion. I think this is because the Q's small sensor is only taking the images from the center of the lens which has the least distortion compared to the outside of the lens. I remember this being the same case for K mounted lenses on the Q. For me personally, I never need to edit the images at all or do any distortion correction but I now have a 14mm equivalent lens on my Q. To get that same viewing angle on the K-x I would need to buy the Sigma 8-16mm lens or the Pentax 12-24mm lens for much more money.
04-18-2012, 05:58 PM   #11
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Interesting. What is the brand and screw in size of the wide that you are using? Might have to try it myself.
thanks
barondla
04-26-2012, 07:20 AM   #12
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The lens is a no-name ebay brand wide-angle lens. I got the wide and tele in a kit for $30 a few years ago. It's a 58mm thread size. You can get a direct step-up ring that will go from the Q to 58mm.

It's definitely worth trying if you have a Q. Helps give the system the ultra wide-angle shots to round out it's super telephoto abilities.
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